Fluid pressure actuating device



AW 395115 F. ROSENBERG 2,55%,6M

' FLUID PRESSURE ACTUATING DEVICE Filed Dec. 11, 1948 v 2 Sheets-Sheet 1IN VEN TOR.

L. F. ROSENBERG FLUID PRESSURE ACTUATING DEVICE Apyifi 24, 3951 2Sheets-Sheet 2 Filed Dec. 11, ,1948

I INVENTOR. .ZQFfiOSGfZGZZQ 0M Patented Apr. 24, 1951 FLUID PRESSUREACTUATING DEVICE Leo F. Rosenberg, Chicago, Ill., assignor offivetwentieths to Betty Christensen and four-twentieths to StanleyHoward, both of Chicago, Ill.

Application December 11, 1948, Serial No. 64,766

3 Claims. 1

This invention relates to new and useful improvements in fluid pressureactuating devices, and has particular relation to an improved cylinderand piston actuator.

The piston of the device of the presentinvention hasa rod which isadapted, for example, to form the ram of a punch press or for othersimilar uses, and the rod has means thereon for operation upon work withwhich alignment must be maintained.

One of the main objects of the present invention is to provide animproved form of device of V the class described wherein the piston andpiston rod are prevented from turning in the operation of the piston,whereby at all times to maintain the work engaging means in alignmentwith the o Another object of the invention is to provide a bar fixedagainst turning to a cylinder head at one end of the cylinder andprojecting axially within the cylinder, in conjunction with a pistonand/or piston rod having an axial bore with-.

in which the bar extends for axial movement of the piston and/or pistonrod along the bar,. and means for splining the piston and/or piston rodto the bar to prevent turning of the piston rod wherebyto maintain thework engaging means inalignment with the work while permitting slidinmovementof the piston within the cylinder.-

Another object of the invention is to provide in an improved form ofdevice of the class described means for securing the bar .to thecylinder head in a manner which will permit the bar to bereleased andturned to different angular positions and fixed against turning to thecylinder-head in any of such different angular positions foradjustmentofthe work engaging mean into different work engaging positions and intodifferent positions for different work.

Another object of the invention is to provide in a deviceof the classdescribed a cylinder head adapted for rigidly mounting the device indifferent positions and also adapted for'mounting the-device forswinging movement.

Another object of the invention is to provide an improved form of devicehaving various features of novelty and advantages, and which isparticularly characterized by its simplicity in construction, itseconomy in manufacture, and its effectiveness in use.

Further objects and advantages of the invention will appear from thefollowing detailed description, taken in connection with theaccompanying drawings which illustrate the manner of constructing andusing an illustrative embodiment of the invention.

In the drawings:

Figure 1 is a fragmentary elevational' view showing a cylinder andpiston actuator embodying the present invention; I

Figure 2 is a top plan view of the cylinder andpiston actuator lookingfrom the top of the de-, vice, as shown in Figure 1;

Figure 3 is a fragmentary detail view of the cylinder and pistonactuator partially in section and partially in elevation;

Figure 4 is a detail section taken on the line 4-4 of Figure 3; and

Figure 5 is a bottom plan view of the lower cylinder head and with thepiston rodin; sectiorn Referring now to the drawings, the numeral Iindicates the tubular cylinder wall having a pair of cylinder heads 2and 3, one at each of the opposite ends thereof. 7

The cylinder heads 2 and 3 have cylindrical protuberances which fittelescopically in the adjacent ends of the cylinder I. The cylinderheadsare secured upon the opposite ends of the cylin-- der I, forexample by screws 4 having heads disposed in recesses in collars 5 andabutting the, shoulders at the inner ends of the recesses and shanksscrewed into the respective cylindemv heads. The collars 5 abut splitrings 6 engaged, in external circumferential grooves l in the, cylinderwall, one adjacent to each of the opposite ends of the cylinder. Anannular sealing ring 8 of suitable material is compressed between eachcylinder head 2 and 3, and the adjacent ends of the cylinder I. I

The cylinder heads 2 and 3 have passages or ports 9 and I 0respectively, to which external pneumatic, fluid, or hydraulic pipes IIand I2 may be connected as shown more or lessdiagrammatically inFigure 1. Valve means (not shown) may be provided for introducing fluidpressure into one end of the cylinder and exhausting the fluid pressureat the opposite end of the cylinder to move the piston I3 and itsconnected piston rod It in one direction, and for reversing the entryand exhaust of fluid pressure to reverse the movement of the piston I3and the" piston rod I4. This, of course, may vary widely within thescope of the invention. I Y,

The piston I3 has reciprocatory movement in the cylinder I and isprovided with yielding portions l5 of rubber, leather, plastic materialor the like which cooperate with the inner surface of the cylinder I.'The rod I4, which is secured to the piston I3 for movement therewith,projects axially through an opening IS in the cylinder head 3. Thecylinder head 3 has, for example, abronze bushing I! secured thereto andtightly embracing the rod It to seal the opening around the piston rodagainst leakage of fluid pressure while permitting reciprocatorymovement of the piston rod through the cylinder head. This mayp ofcourse, vary, for example, by providing the opening I6 through thecylinder head 3 with any suitable packing or sealing structure.

Mounted upon the piston rod [4 externally of the cylinder I and theadjacent cylinder head 3 is work engaging means for operation upon workwith which alignment must be maintained. The work engaging means shownin Figure 1 comprises, for example, punches 18 secured in a punch holderit by set screws 20. The punch holder I9 is secured upon the adjacentend of the piston rod 14 by a set screw 2|.

The work which is shown in Figure 1 in the form of fiat sheet metalstock 22 is fed over a bolster member 23 which has holes 24 into whichthe punches 18 are adapted to enter upon passing through the stockoperated upon by the punches. A stripper plate 25 has openings 26through which the punches pass, and is adapted to strip thestock fromthe punches upon retraction of the latter.

A bar or rod 21 is fixed against turning movement to the cylinder head2, and projects axially within the cylinder l. The piston l3 and pistonrod l4 have an axial bore 28 within which the bar 2'! extends for axialsliding movementof the piston and piston rod on the bar 2?. The piston13 and piston rod M are keyed or splined against turning movementrelative to the bar 27, for example, by diametrically opposite andlongitudinally extending keys or splines 29 which engage in registeringgrooves 30 in the outer periphery of the bar 21 and in the innerperiphery of the bore in an inserted bushing 39. The inserted bushing 29has pressed fit at 40 in an opening 42 in the adjacent end of the pistoni3. a'nce is preferabl provided between the bar 27 and the bore 28 inthe piston l3 and piston rod M. In this way the punches it or other workengaging elements are maintained at all times in accurate alignment withthe work, while permitting reciprocation of the piston to move the workengaging means into and out of engagement with the work.

- In the illustrated embodiment of the invention, the outer end of thebar 27 is shouldered at 3| for abutment against a cooperating shoulderon the cylinder head 2, and has a reduced threaded shank 32 whichprojects outwardly through an axial openin 33 in the cylinder head 2. Anut 34 is screwed onto the threaded shank 32, and a lock washer 34' isinterposed between the nut 34 and the cylinder head 2 to lock or fix thebar 21 against turning relative to the cylinder head 2.

With the structure described, the bar 2'! can be released by unscrewingor releasing the nut 34 and turned to different positions and fixedagainst turning to the cylinder head 2 in any of such differentpositions by again tightening the nut 34. This permits adjustment of thepunches l8 or other work engaging means into difierent work engagingpositions and into difierent positions for difierent work. 1

In the illustrated embodiment of the invention, the cylinder head 2 hascircumferentially spaced openings 35 through which bolts or screws (notshown) may be inserted for rigid endwise mounting of the device on asuitable support. The cylinder head 2 also has a splayed peripheralsurface having a threaded openin 31 for receiving a bolt or screw formounting the device sidewise in rigid position upon a suitable support.The cylinderhead' 2 further has diametrically opposite andradiallyprojecting pins or trunnions 38 for mountin the device forswingingmovement one suitable support. The trunnions as may beClearplaced on the cylinder head 3 instead of on the cylinder head 2where, for example, a shorter distance is desired between the pivotalsupport of the device and the work engaging means on the piston rod. Thecylinder head 3 may have an opening 35, splayed side 36', and threadedopening 37 corresponding to openings 35, splayed side 36, and threadedopening 31 of the cylinder head 2.

The embodiment of the invention shown in the drawings is forillustrative purposes only, and it is to be expressly understood thatsaid drawings and the accompanying specification are not to be construedas a definition of the limits or scope of the invention, reference beinghad to the appended claims for that purpose.

I claim:

1. In a reciprocatory precision work engaging device, in combination, acylinder having first and second cylinder heads one at each of itsopposite ends; a guide ro'd mounted in said first cylinder head forturning movement about its axis in any desired amount and throughcomplete 360 and projecting axially inwardly from said first cylinderhead, a piston reciprocable in said' 1 cylinder and having an axial boretelescopically receiving said guide rod, said piston having a piston rodprojecting for reciprocatory movement through said second cylinder head,work engaging means on said piston rod externally of said cylinder foroperation upon work with which precision alignment is desired, theturning movement of said guide rod permitting precision alignment ofsaid work engaging means with different work in any precision alignmentposition throughout 360 about its axis, and means for locking said guiderod and thereby said work engaging means in any of said differentangular precision alignment positions.

2. A reciprocatory precision work-engaging device according 'to claim 1wherein the guide rod the different angular precision alignmentpositions locks the shoulder on the guide rod endwise against thecooperating shoulder on the first cylinder head.

3. A reciprocatory precision work-engaging device according to claim 1wherein the guide rod has a shoulder for endwise abutment against acooperating shoulder on said first cylinder head and a reduced threadedshank projecting outwardly from the first cylinder head, and wherein themeans for locking the guide rod and thereby the work engaging means inany of the different angular precision alignment positions comprises a-,nut screwed on the projecting threaded shank of the guide rod forlocking the shoulder on the guiderod endwise against the cooperatingshoulder on the first cylinder head.

LEO F. ROSENBERG.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS

